package com.example.java_chatroom.api;

import com.example.java_chatroom.model.Friend;
import com.example.java_chatroom.model.FriendMapper;
import com.example.java_chatroom.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.ArrayList;
import java.util.List;

@RestController
public class FriendAPI {
    @Autowired
    private FriendMapper friendMapper;

    @GetMapping("/friendList")
    public Object getFriendList(HttpServletRequest req) {
        // 1. 从会话中, 获取到 userId 是啥
        HttpSession session = req.getSession(false);
        if (session == null) {
            // 会话不存在 (没登录)
            // 返回空的列表
            System.out.println("[getFriendList] session 不存在");
            return new ArrayList<Friend>();
        }
        User user = (User) session.getAttribute("user");
        if (user == null) {
            // 当前用户对象没在会话中存在
            System.out.println("[getFriendList] user 不存在");
            return new ArrayList<Friend>();
        }
        // 2. 根据 userId 从数据库查询数据即可
        List<Friend> friendList = friendMapper.selectFriendList(user.getUserId());
        return friendList;
    }
}
